@conference {dd4938cc4ef54abaa0a9852459e3ebc3,
	title = {Fast fracture in slow motion},
	booktitle = {2008 Proceedings of the 9th Biennial Conference on Engineering Systems Design and Analysis},
	series = {2008 Proceedings of the 9th Biennial Conference on Engineering Systems Design and Analysis},
	year = {2009},
	note = {2008 9th Biennial Conference on Engineering Systems Design and Analysis ; Conference date: 07-07-2008 Through 09-07-2008},
	pages = {521{\textendash}527},
	abstract = {We present recent results of fracture experiments in polyacrylamide gels. Polyacrylamide gels are soft polymer materials in which the characteristic sound speeds are on the order of a few meters/sec - thereby slowing down fracture dynamics by 3 orders of magnitude. We first demonstrate the universality of rapid fracture dynamics, comparing dynamics observed in gels with those seen in "classic" brittle materials such as glass. Among the common features are the appearance and form of branching instabilities as well as characteristic attributes of the resulting fracture surface that provide evidence for crack front inertia when translational invariance along the front is broken. We then demonstrate a number wholly new aspects of the fracture process, whose study is only made possible by utilizing the "slow motion" inherent in the fracture of these materials. These include both a new oscillatory instability at about 90\% of the Rayleigh wave speed and measurements of the nonlinear zone at the tip of dynamic cracks.},
	isbn = {9780791848364},
	author = {Ariel Livne and Gil Cohen and Jay Fineberg}
}
